Werk #12470: BI: Fixed needless recompilation of BI aggregates

Component	BI
Title	BI: Fixed needless recompilation of BI aggregates
Date	May 18, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Due to race conditions, the BI aggregates could be compiled too often. This had only one effect on performance, but now other visible drawbacks.

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